<h2 ui-dragdrop="dragdropPadding">
    　立方体
</h2>
<ul class="list">
    <li title="球体" class="sphere" name="sphere">
        球体
        <span class="add" title="点击我添加球体" ui-on:click="addGeometry"></span>
    </li>
    <li title="棱柱体" class="prism" name="prism">
        棱柱体
        <span class="add" title="点击我添加棱柱体" ui-on:click="addGeometry"></span>
    </li>
    <li title="圆柱体" class="cylinder" name="cylinder">
        圆柱体
        <span class="add" title="点击我添加圆柱体" ui-on:click="addGeometry"></span>
    </li>
</ul>